BIOL130 Chapter Notes - Chapter 11: Lipid Bilayer, Amphiphile, Hydrophile
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31 Dec 2015
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Two ply-sheet of lipid molecules, into which proteins have been inserted. More than just a barrier, nutrients must pass inward and waste products must pass out. Receptors: receive information about the changes in the environment. The membranes surrounding the organelles differ in subtle details from the plasma membrane (especially in the resident proteins) It"s mostly the proteins that give different membranes their individual characteristics. How lipids behave in an aqueous environment. Lipids in cell membranes: a hydrophilic head and a hydrophobic tail. Most abundant lipid: phospholipids: phosphate containing (hydrophilic) head linked to a pair of hydrophobic tails. Amphipathic: phospholipids, cholesterol, and glycolipids (which have sugars as part of their hydrophilic head) Amphipathic: help them assemble into bilayers in an aqueous environment. Hydrophilic molecules: contain either charged groups or uncharged polar groups (electrostatic attractions or hydrogen bonds with water molecules) Hydrophobic molecules: uncharged and nonpolar: they force adjacent water molecules to reorganize into a cage-like structure around them.
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